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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 784 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.49² =
  2. 2.19² =
  3. 3.69² =
  4. 4.69² =
  5. 5.39² =
  6. 6.61² =
  7. 7.19² =
  8. 8.61² =
  9. 9.61² =
  10. 10.41² =
  11. 11.59² =
  12. 12.79² =
  13. 13.89² =
  14. 14.61² =
  15. 15.89² =
  16. 16.79² =
  17. 17.89² =
  18. 18.41² =
  19. 19.21² =
  20. 20.19² =
  21. 21.51² =
  22. 22.21² =
  23. 23.49² =
  24. 24.59² =
  25. 25.51² =
  26. 26.29² =
  27. 27.59² =
  28. 28.39² =
  29. 29.41² =
  30. 30.21² =
  31. 31.39² =
  32. 32.39² =
  33. 33.29² =
  34. 34.81² =
  35. 35.71² =
  36. 36.21² =
  37. 37.29² =
  38. 38.41² =
  39. 39.59² =
  40. 40.51² =

Answer key

  1. 2401
  2. 361
  3. 4761
  4. 4761
  5. 1521
  6. 3721
  7. 361
  8. 3721
  9. 3721
  10. 1681
  11. 3481
  12. 6241
  13. 7921
  14. 3721
  15. 7921
  16. 6241
  17. 7921
  18. 1681
  19. 441
  20. 361
  21. 2601
  22. 441
  23. 2401
  24. 3481
  25. 2601
  26. 841
  27. 3481
  28. 1521
  29. 1681
  30. 441
  31. 1521
  32. 1521
  33. 841
  34. 6561
  35. 5041
  36. 441
  37. 841
  38. 1681
  39. 3481
  40. 2601

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